// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/gl/android/surface_texture.h"

#include <android/native_window_jni.h>

#include "base/android/jni_android.h"
#include "base/logging.h"
#include "jni/SurfaceTexturePlatformWrapper_jni.h"
#include "ui/gl/android/scoped_java_surface.h"
#include "ui/gl/android/surface_texture_listener.h"
#include "ui/gl/gl_bindings.h"

namespace gfx {

scoped_refptr<SurfaceTexture> SurfaceTexture::Create(int texture_id)
{
    JNIEnv* env = base::android::AttachCurrentThread();
    return new SurfaceTexture(
        Java_SurfaceTexturePlatformWrapper_create(env, texture_id));
}

SurfaceTexture::SurfaceTexture(
    const base::android::ScopedJavaLocalRef<jobject>& j_surface_texture)
{
    j_surface_texture_.Reset(j_surface_texture);
}

SurfaceTexture::~SurfaceTexture()
{
    JNIEnv* env = base::android::AttachCurrentThread();
    Java_SurfaceTexturePlatformWrapper_destroy(env, j_surface_texture_.obj());
}

void SurfaceTexture::SetFrameAvailableCallback(
    const base::Closure& callback)
{
    JNIEnv* env = base::android::AttachCurrentThread();
    Java_SurfaceTexturePlatformWrapper_setFrameAvailableCallback(
        env, j_surface_texture_.obj(),
        reinterpret_cast<intptr_t>(new SurfaceTextureListener(callback, false)));
}

void SurfaceTexture::SetFrameAvailableCallbackOnAnyThread(
    const base::Closure& callback)
{
    JNIEnv* env = base::android::AttachCurrentThread();
    Java_SurfaceTexturePlatformWrapper_setFrameAvailableCallback(
        env, j_surface_texture_.obj(),
        reinterpret_cast<intptr_t>(new SurfaceTextureListener(callback, true)));
}

void SurfaceTexture::UpdateTexImage()
{
    JNIEnv* env = base::android::AttachCurrentThread();
    Java_SurfaceTexturePlatformWrapper_updateTexImage(env,
        j_surface_texture_.obj());
}

void SurfaceTexture::GetTransformMatrix(float mtx[16])
{
    JNIEnv* env = base::android::AttachCurrentThread();

    base::android::ScopedJavaLocalRef<jfloatArray> jmatrix(
        env, env->NewFloatArray(16));
    Java_SurfaceTexturePlatformWrapper_getTransformMatrix(
        env, j_surface_texture_.obj(), jmatrix.obj());

    jboolean is_copy;
    jfloat* elements = env->GetFloatArrayElements(jmatrix.obj(), &is_copy);
    for (int i = 0; i < 16; ++i) {
        mtx[i] = static_cast<float>(elements[i]);
    }
    env->ReleaseFloatArrayElements(jmatrix.obj(), elements, JNI_ABORT);
}

void SurfaceTexture::AttachToGLContext()
{
    int texture_id;
    glGetIntegerv(GL_TEXTURE_BINDING_EXTERNAL_OES, &texture_id);
    DCHECK(texture_id);
    JNIEnv* env = base::android::AttachCurrentThread();
    Java_SurfaceTexturePlatformWrapper_attachToGLContext(
        env, j_surface_texture_.obj(), texture_id);
}

void SurfaceTexture::DetachFromGLContext()
{
    JNIEnv* env = base::android::AttachCurrentThread();
    Java_SurfaceTexturePlatformWrapper_detachFromGLContext(
        env, j_surface_texture_.obj());
}

ANativeWindow* SurfaceTexture::CreateSurface()
{
    JNIEnv* env = base::android::AttachCurrentThread();
    ScopedJavaSurface surface(this);
    // Note: This ensures that any local references used by
    // ANativeWindow_fromSurface are released immediately. This is needed as a
    // workaround for https://code.google.com/p/android/issues/detail?id=68174
    base::android::ScopedJavaLocalFrame scoped_local_reference_frame(env);
    ANativeWindow* native_window = ANativeWindow_fromSurface(
        env, surface.j_surface().obj());
    return native_window;
}

bool SurfaceTexture::RegisterSurfaceTexture(JNIEnv* env)
{
    return RegisterNativesImpl(env);
}

} // namespace gfx
